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CVE-2024-47700: ext4: check stripe size compatibility on remount as well

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-10-21 · updated 2026-06-17
• Weakness: CWE-369

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: check stripe size compatibility on remount as well We disable stripe size in __ext4_fill_super if it is not a multiple of the cluster ratio however this check is missed when trying to remount. This can leave us with cases where stripe < cluster_ratio after remount:set making EXT4_B2C(sbi->s_stripe) become 0 that can cause some unforeseen bugs like divide by 0. Fix that by adding the check in remount path as well.

Affected products

• Linux kernel: from 6.5 before 6.6.54; from 6.7 before 6.10.13; from 6.11 before 6.11.2 — fixed in 6.10.13, 6.11.2, 6.6.54

How to fix

Upgrade to a fixed version: Linux kernel 6.10.13, 6.11.2, 6.6.54. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/297615e992bbb30a55c158141086be6505d5d722
• https://git.kernel.org/stable/c/a31b712f75445d52fc0451dc54fd7b16a552cb7c
• https://git.kernel.org/stable/c/ee85e0938aa8f9846d21e4d302c3cf6a2a75110d
• https://git.kernel.org/stable/c/faeff8b1ee2eaa5969c8e994d66c3337298cefed

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